Pole-piece for electric machines.



No. 826,55@ A PATENTE@ JULY 24, 190e. y1L GHRISTENSBN. POLE PIEcBgFoR Bumm MAQHINBS.

Arrmdnlon FILED APR, u. moa.

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No. 326,650. Y PATBNTED JULY 24, 1905. N. A. GERISTBNSBN.

PGLE NEUE PDR SLEGTRIU M INES. nrmourol mpgs 11:31.11.

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NlELS ANTON UHRISTENSEN, OF MILWAUKEE, WISCONSIN.

POLE-PIECE FOR ELECTRIC MACHlNES.

Specification of Letters Patent.

Patented July 24,1906.

Application le April 11.1901. Serial Nox 55,839.

To all whom zit may concern:

Be it known that l, NIELS ANToN Cinne- TENSEN, residing at Milwaukee, Milwaukee county, Wisconsin, have invented certain new end useful Improvements in Pole- Pieces forElectric vMachines and Methode of Making the Seme, of Vwhich the following is e speciicetion. Y

My invention consists in the production of e new pole-piece for electric machines end in the process or method of making the same. 1n general terms the new poleicce, either seperate from or integral Wit i the fieldframe, consiste of e series of pieces or lates of shoot motel forming elexnineted pole-V ace und on which ie ceet the liodyport-ion of the polepiere either alone where the )oc-piecois to be inode seperate or detachable from the lleid- {reme or together with euch frmnc'when the ole-picco ie to be mede integral therewith, The resulting pole-piece, therefore, has o laminated (Yolo-fece and e homogeneous buck or lio v portion-that ie, it ie pertiy laminated and partly homogeneous.

[n looking armature-disks for electric nui.-

chinos oi my manufacture the corners of the ehect motel lieve heretofore been thrown civey es scrap; but l lieve found that they muy lio utilized in tio, making ci o, liunineted 'pole-luce whereby if erticelly ull ofthe metal is utilized citlior lier 'the ernmturcdisks or lor iiic pole-pieces. lt is preferred to use this Scrnp n matter of economy, although obviously spi-)ciel und iret--l'iund sheet metal may be used.

in tho dra-wings, Figure 1 is e plan of e shcctof metal out of which lies been stern ed sin urmuturwilisk, leaving four corners; ig 2, e.` plan of one of said corners alter being Stamped or cut to constitute one of the plates for tlir` linninsited pole-fece; Fig. 3, an end elevation, partly in section, of the freine of un electric machine, showing my new ole pieces; Fig. 4, n pers ective of the emineted portion or pole-'ece of my iole, and Fig. 5 e. perspective of the complete pole- Jniece when my invention is embodied in e pole-piece of the removable or dotuchefble 'the plates or fece 5 thereof. The plete is preferably pro vided with e suitable number of hoies 6 ,to receive rivets, es hereinafter described, Vand also provided with suitable notches or re` cesses 7 and pro er anchorage for the cest motel, es here 8 in the sides thereof to essi-1re ma ter specified. Obviously e compound die instead of two single dies may be used ,to cut out the arnieturedisks and the plates?) et n single operation. Each plete me be of any desired dimensions sind of any eeired simpe es to its roer portion or face.

series of these pole-plates of enumber to Ineke the proper size of pole-piece ere now launched,

and bound to ether by rivets 9, paninoy through the lio es 6, end binding-plates 10 o suitable tiiclincssbeing preferelilyern .doyod 'The 3iri 1e-fneethet is, the inside sur ece toward the erineture--is coni. etey inisned without the need of any fortlijicr machinery, leminatiens having been punched und trimmed so :is to be of en exact circle et the central portion, with the poletipsldiverging slightly tengentieliy from the circ e.

The work above described is that usually done in a machine-shop, and the completed and esseinbiod bunch of pole-plates is now teken to tile foon dry, and when it isdesired to ineke the polo-piece of the removable type scid. 'platee ere properly set in the Vmold n homogeneous body portion or bloei( l'l is cnet onto the beck or reer eide of the polo-- plates, after which the resulting pole-niece is teken beck to the machine-shop and its outer fece i2 finished or machined, so `as to accurately it Aupontne usual pedi?) 4on the interior well of the field-frame 14 of errerleca tric machine, es seen in Fi 3, the pole-piece being secured in the usue Way by bolts 15. lfvhens however, the pole-piece to 'lic of that solid clase integral with the field-freine. the requisite number of sets of hunched Fletes is placed in the mold for the fieldreme Y sind blocks Yor reel1 ends of the p`ole-picces ere then cest, suoli ends of the polePpieccs lacing cost directly upon said plates. iiiietlier the pole-pieces are thus mede seperately or integral with the fielfblrnme, it may ine seid. that blocks or backs are cost upon the pictos. The completed poleepiece thus becomes en intogre structure composed of o homogeneons block or body portion and e einineted portion or poledece, the former being cest directly upon the letter portion, which when said scrap is used, as herein suggested, is of substantially triangular shape in crosssection. When the block or body portion is thus cast onto these plates, the metal runs into the notches 7 and 8, and thereby secures iirm anchorage thereon, whereb a practically integral pole-piece results. Vi hile the sides of the bunched plates may be suffi ciently rough of themselves for the purpose, yet it is desirable and preferable to employ notches specially provided.

Although my invention is shown embodied in a pole-piece of the removable or detachable t pe, yet it is obvious from the foregoing description that it is not to be limited thereto; but, on the contrary,the same may be embodied ina pole-piece of the type solid or integral with the field-frame.

I claiml. An integral pole-piece formed as a separate structure and whose front face is laminated by means of plates hunched together m con-tact with each other, and whose back is a homogeneous block or body cast upon said plates and adapted to lit a field-frame.

2. A11 integral pole-piece formed as a separate structure, and having a laminated face consisting of like pieces of sheet-iron arranged .contiguously and held in contact with `each other, each of said pieces having a curved face and a square face or edge, and a homogeneous block or body portion of iron cast thereon, said block or body portion being cast upon the square edges or faces of sald pieces of sheet-iron.

3. An integral pole-piece presented radially to an armature and whose front portion has a laminated face composed of a bunch of plates in contact with each other and Whose rear portion is cast onto the front portion and is homogeneous in character said resultingv structure being separate from the 'usual eldsframe.

4. An integral pole-piece presented radially to an armature and having a laminated face composed of a bunch of sheet-metal plates contiguously arranged and having notches on their rear or inner side and a back cast upon the plates and anchored in the notches, said completed pole-piece being an integral structure and separate from the usual field-frame.

5. A pole-piece comprising a laminated face composed of a bunch of plates arranged contiguously and in contact with each other and a back cast upon the rear end of such bunch of plates and separate from the usual held-frame.

6. An integral pole-piece com rising a laminated face composed of a bunch of plates arranged contiguously and in contact with each other, end binding-plates on said bunch of plates and a block cast onto the block of said plates, and forming the rear portion of such pole-piece which is separate `from the usual field-frame.

7. A pole-piece composed of a series of substantially triangular pieces hunched and held together to form 'the pole-face and a substantially homogeneous back thereon.

8. A pole-piece composed of a series of substantially triangular pieces or plates which are cut out from the scrap resulting from the cutting of armature-disks and each of which have the'pole-face 5 and pole-tips 4 and a block cast on the back of the plates.

E). A removable pole-piece composed of a series of plates to form a laminated face and a homogeneous block cast onto the back of such plates and having its outer face l2 nished to fit a field-frame.

10. A pole-piece composed of a series of substantially triangular pieces or plates, each NILS ANTON CHRISTENSEN.

Witnesses:

H. W. RAMIEN, JOHN DADMUN. 

